class Zip::ExtraField::UniversalTime

def ==(other)
  @mtime == other.mtime &&
    @atime == other.atime &&
    @ctime == other.ctime
end

def atime=(time)
  @flag = time.nil? ? @flag & ~ATIME_MASK : @flag | ATIME_MASK
  @atime = time
end

def ctime=(time)
  @flag = time.nil? ? @flag & ~CTIME_MASK : @flag | CTIME_MASK
  @ctime = time
end

def initialize(binstr = nil)
  @ctime = nil
  @mtime = nil
  @atime = nil
  @flag  = 0
  merge(binstr) unless binstr.nil?
end

def merge(binstr)
  return if binstr.empty?
  size, content = initial_parse(binstr)
  return if !size || size <= 0
  @flag, *times = content.unpack('Cl<l<l<')
  # Parse the timestamps, in order, based on which flags are set.
  return if times[0].nil?
  @mtime ||= ::Zip::DOSTime.at(times.shift) unless @flag & MTIME_MASK == 0
  return if times[0].nil?
  @atime ||= ::Zip::DOSTime.at(times.shift) unless @flag & ATIME_MASK == 0
  return if times[0].nil?
  @ctime ||= ::Zip::DOSTime.at(times.shift) unless @flag & CTIME_MASK == 0
end

def mtime=(time)
  @flag = time.nil? ? @flag & ~MTIME_MASK : @flag | MTIME_MASK
  @mtime = time
end

def pack_for_c_dir
  s = [@flag].pack('C')
  s << [@mtime.to_i].pack('l<') unless @flag & MTIME_MASK == 0
  s
end

def pack_for_local
  s = [@flag].pack('C')
  s << [@mtime.to_i].pack('l<') unless @flag & MTIME_MASK == 0
  s << [@atime.to_i].pack('l<') unless @flag & ATIME_MASK == 0
  s << [@ctime.to_i].pack('l<') unless @flag & CTIME_MASK == 0
  s
end